/* * copyright (c) 2006 Michael Niedermayer <michaelni@gmx.at> * * This file is part of FFmpeg. * * FFmpeg is free software; you can redistribute it and/or * modify it under the terms of the GNU Lesser General Public * License as published by the Free Software Foundation; either * version 2.1 of the License, or (at your option) any later version. * * FFmpeg is distributed in the hope that it will be useful, * but WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU * Lesser General Public License for more details. * * You should have received a copy of the GNU Lesser General Public * License along with FFmpeg; if not, write to the Free Software * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA */ /** * @file libavutil/mem.h * memory handling functions */ #ifndef AVUTIL_MEM_H #define AVUTIL_MEM_H #include "common.h" #if AV_GCC_VERSION_AT_LEAST(3,1) #define av_malloc_attrib __attribute__((__malloc__)) #else #define av_malloc_attrib #endif #if (!defined(__ICC) || __ICC > 1100) && AV_GCC_VERSION_AT_LEAST(4,3) #define av_alloc_size(n) __attribute__((alloc_size(n))) #else #define av_alloc_size(n) #endif /** * Allocates a block of \p size bytes with alignment suitable for all * memory accesses (including vectors if available on the CPU). * @param size Size in bytes for the memory block to be allocated. * @return Pointer to the allocated block, NULL if the block cannot * be allocated. * @see av_mallocz() */ void *av_malloc(unsigned int size) av_malloc_attrib av_alloc_size(1); /** * Allocates or reallocates a block of memory. * If \p ptr is NULL and \p size > 0, allocates a new block. If \p * size is zero, frees the memory block pointed to by \p ptr. * @param size Size in bytes for the memory block to be allocated or * reallocated. * @param ptr Pointer to a memory block already allocated with * av_malloc(z)() or av_realloc() or NULL. * @return Pointer to a newly reallocated block or NULL if the block * cannot be reallocated or the function is used to free the memory block. * @see av_fast_realloc() */ void *av_realloc(void *ptr, unsigned int size) av_alloc_size(2); /** * Frees a memory block which has been allocated with av_malloc(z)() or * av_realloc(). * @param ptr Pointer to the memory block which should be freed. * @note ptr = NULL is explicitly allowed. * @note It is recommended that you use av_freep() instead. * @see av_freep() */ void av_free(void *ptr); /** * Allocates a block of \p size bytes with alignment suitable for all * memory accesses (including vectors if available on the CPU) and * zeroes all the bytes of the block. * @param size Size in bytes for the memory block to be allocated. * @return Pointer to the allocated block, NULL if it cannot be allocated. * @see av_malloc() */ void *av_mallocz(unsigned int size) av_malloc_attrib av_alloc_size(1); /** * Duplicates the string \p s. * @param s string to be duplicated * @return Pointer to a newly allocated string containing a * copy of \p s or NULL if the string cannot be allocated. */ char *av_strdup(const char *s) av_malloc_attrib; /** * Frees a memory block which has been allocated with av_malloc(z)() or * av_realloc() and set the pointer pointing to it to NULL. * @param ptr Pointer to the pointer to the memory block which should * be freed. * @see av_free() */ void av_freep(void *ptr); #endif /* AVUTIL_MEM_H */